Update Rust crate regex to 1.8.4 (#1912)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [regex](https://github.com/rust-lang/regex) | dependencies | patch | `1.8.1` -> `1.8.4` |

---

### Release Notes

<details>
<summary>rust-lang/regex</summary>

### [`v1.8.4`](https://github.com/rust-lang/regex/blob/HEAD/CHANGELOG.md#&#8203;184-2023-06-05)

[Compare Source](rust-lang/regex@1.8.3...1.8.4)

\==================
This is a patch release that fixes a bug where `(?-u:\B)` was allowed in
Unicode regexes, despite the fact that the current matching engines can report
match offsets between the code units of a single UTF-8 encoded codepoint. That
in turn means that match offsets that split a codepoint could be reported,
which in turn results in panicking when one uses them to slice a `&str`.

This bug occurred in the transition to `regex 1.8` because the underlying
syntactical error that prevented this regex from compiling was intentionally
removed. That's because `(?-u:\B)` will be permitted in Unicode regexes in
`regex 1.9`, but the matching engines will guarantee to never report match
offsets that split a codepoint. When the underlying syntactical error was
removed, no code was added to ensure that `(?-u:\B)` didn't compile in the
`regex 1.8` transition release. This release, `regex 1.8.4`, adds that code
such that `Regex::new(r"(?-u:\B)")` returns to the `regex <1.8` behavior of
not compiling. (A `bytes::Regex` can still of course compile it.)

Bug fixes:

-   [BUG #&#8203;1006](rust-lang/regex#1006):
    Fix a bug where `(?-u:\B)` was allowed in Unicode regexes, and in turn could
    lead to match offsets that split a codepoint in `&str`.

### [`v1.8.3`](https://github.com/rust-lang/regex/blob/HEAD/CHANGELOG.md#&#8203;183-2023-05-25)

[Compare Source](rust-lang/regex@1.8.2...1.8.3)

\==================
This is a patch release that fixes a bug where the regex would report a
match at every position even when it shouldn't. This could occur in a very
small subset of regexes, usually an alternation of simple literals that
have particular properties. (See the issue linked below for a more precise
description.)

Bug fixes:

-   [BUG #&#8203;999](rust-lang/regex#999):
    Fix a bug where a match at every position is erroneously reported.

### [`v1.8.2`](https://github.com/rust-lang/regex/blob/HEAD/CHANGELOG.md#&#8203;182-2023-05-22)

[Compare Source](rust-lang/regex@1.8.1...1.8.2)

\==================
This is a patch release that fixes a bug where regex compilation could panic
in debug mode for regexes with large counted repetitions. For example,
`a{2147483516}{2147483416}{5}` resulted in an integer overflow that wrapped
in release mode but panicking in debug mode. Despite the unintended wrapping
arithmetic in release mode, it didn't cause any other logical bugs since the
errant code was for new analysis that wasn't used yet.

Bug fixes:

-   [BUG #&#8203;995](rust-lang/regex#995):
    Fix a bug where regex compilation with large counted repetitions could panic.

</details>

---

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---

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Reviewed-on: https://codeberg.org/Calciumdibromid/CaBr2/pulls/1912
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crates/load_save/Cargo.toml

@@ -17,7 +17,7 @@ lazy_static = "1.4.0"
 log = "0.4.19"
 lopdf = { version = "0.30.0", optional = true }
 quick-xml = { version = "0.28.2", features = ["serialize"], optional = true }
-regex = { version = "1.8.1", optional = true }
+regex = { version = "1.8.4", optional = true }
 serde = { version = "1.0.162", features = ["derive"] }
 serde_json = { version = "1.0.96", optional = true }
 thiserror = "1.0.40"

crates/search/Cargo.toml

@@ -18,7 +18,7 @@ futures = { version = "0.3.28", optional = true }
 lazy_static = "1.4.0"
 log = "0.4.19"
 quick-xml = { version = "0.28.2", optional = true, features = ["serialize"] }
-regex = { version = "1.8.1", optional = true }
+regex = { version = "1.8.4", optional = true }
 reqwest = { version = "0.11.17", features = ["deflate", "gzip", "json", "native-tls"], default-features = false, optional = true }
 serde = { version = "1.0.162", features = ["derive"] }
 serde_json = "1.0.96"